Luden's Echo and Karthus ult
Gains charges upon moving or casting. At 100 charges, the next spell hit expends all charges to deal 100 (+0.15 ability power) bonus magic damage to up to 4 targets on hit. Applies spell Effects (e.g., Spell Vamp, Rylai's, etc).
How does this behave with Karthus ultimate?
Pictures about "Luden's Echo and Karthus ult"
Bring Me The Horizon - Ludens (Official Video)
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Anete Lusina, Anete Lusina, Anete Lusina, Anete Lusina